Were building a new house and are wondering if you can insulate under slab with foam polyurethane. It is also recommended that a protective layer (stucco or concrete slurry) be installed over the insulation to avoid damage during and after construction. These codes do not require any insulation for slabs that are more than 12 in. That would mean your mesh and mesh chairs don’t sit at an even level, nor does your rebar, and then the thickness of concrete may in turn vary as well, so you may need a little more, or it may be too thin in some areas. I am torn over whether to use Insul-Tarp under the slab. EcoFoil reflective bubble concrete floor insulation products accomplish all of this, as well as providing a barrier for radon. Get home building tips, offers, and expert advice in your inbox. EcoFoil Under Slab Insulation (1/4" to 5/16") thick, is manufactured with a single layer metalized reflective sheet laminated between two layers of strong polyethylene bubbles. This foam insulation is ideal for insulating floors and foundations. Here are a few techniques to help you capture more value.

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Other advantages of stem wall slabs include: Insulation being installed on the inside of the stem wall before foundation is backfilled and poured. I wouldn’t go as far as saying you 'couldn't' use spray foam below a slab, but I’m not sure why you’d want to. We’re happy to help find the program that’s right for you!

When building a slab on grade, EPS rigid foam insulation is the most common choice of insulation, for performance and cost. When it comes to insulating foundations, you can look to the codes for requirements, but know that they may not represent best practices.


This can add additional energy savings especially in cold climates. Under Slab Insulation (pour concrete directly on top of the panels) Radiant Floor Heating Installations (fasten tubing directly onto the panels; no special connectors needed) INSTA-PANELS ® are Easier to Install, Less Expensive, and More Durable than competing products.

Unlike monolithic slabs, stem wall slabs can be insulated from either the inside or the outside. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. There are no requirements for horizontal insulation under slabs, but the requirements for perimeter insulation can be met partially with horizontal insulation. Copyright @ 2008-2020 All Rights Reserved, Under Slab Installation - Concrete Radiant Floor, Under Slab Installation - Radiant Snow Melt Slab, Under Slab Installation - Radiant Floor Over Wood, Eliminates condensation and moisture on concrete, Moderates concrete slab temperature (works great with, Quick and easy to install (see below on how to insulate a concrete slab floor), Extremely strong compression rate at 140 PSI and high puncture rate at 85 PSI, Creates a thermal barrier between the ground and the concrete slab, Provides an excellent vapor and radon barrier when the seams are taped. Builders with a bigger budget, especially those in cold climates, should consider installing continuous horizontal insulation under the entire slab. Because they are easier to insulate, slab foundations with stemwalls are preferable to monolithic slabs. This encapsulates the reflective foil sheet preventing it from being exposed to the ground or the concrete, ensuring the life and performance of the product. At a minimum, this type of foundation requires vertical perimeter insulation to separate the slab from the stemwall.

Why insulate under a slab on grade foundation…, Outlining the benefits & drawbacks of slab-on-grade construction compared to basement foundations - As the first step of home design is deciding which foundati…, Why are basements moldy?

There may be a case to be made for EPS rigid insulation. We recommend our 3" White Seam Tape for this application. The area between the stemwalls is usually filled with compacted gravel to support the slab. It is specifically designed for use as a thermal barrier under concrete and works superbly with radiant heat system. This bubble insulation product also gives more reflectivity when used in a heated slab than any other concrete insulation product on the market.

perimeter slab insulation Heat Loss through an Insulated Slab Windows 33% Roof/Ceiling 8% Slab 15% 6 Doors 5% Walls 39% Insulation and Fenestration Criteria Table 402.1.1 Insulation and Fenestration Requirements by Componenta CLIMATE ZONE FENESTRATION U-FACTORb SKYLIGHTb U-FACTOR GLAZED FENESTRATIONb,e SHGC CEILING R-VALUE WOOD FRAME WALL R-VALUE MASS WALL R … © 2020 The Taunton Press, Inc. All rights reserved. Are foam…, Basement mold and mildew can easily be avoided with better designed walls. Building Science Guide: Best Practices for High-Performance Homes. We are also maintaining an air space by placing the foil in between the bubble layers. Dealing With Fireplaces and Energy Efficiency, Plus, get an extra 20% off with code GIFT20, Insulating Foundations for Thermal Performance and Durability, An Interview with Al Tozer: The Living Building Challenge, FHB House Remodel 2020: Pre-Remodel Walkthrough, Building a Concrete-Free “Slab”-on-Grade Foundation, Expert insights on techniques and principles. (Make sure EPS is rated for ground contact.). In order to understand why and how to maximize the benefits of insulated slabs, we need to understand how climate and temperature come into play. EcoFoil Under Slab Insulation has a compression strength of 140 PSI. Additional benefits are that EcoFoil Under Slab Insulation provides a vapor and radon barrier. This image shows how this can be done properly. Other times, they are unclear. Access the Free Guide to Slab Insulation Techniques.
Beefing up your R-values or insulation strategy, if the budget allows, is rarely a bad idea. If left uninsulated, stem wall slabs still have the same potential for conductive heat loss. If the foil surface comes into direct contact with certain acidic soils it can corrode the reflective properties of the insulation. While slab insulation is more durable than often assumed, best practice is to protect it using a stucco or flashing material. If you want to save money, you can install a 4-ft.-wide band of horizontal R-10 (or higher) insulation at the perimeter of the slab in a picture-frame configuration. When building a slab on grade, EPS rigid foam insulation is the most common choice of insulation, for performance and cost.

Insulating the inside of the slab negates need for the termite inspection gap, provides protection for the insulation, and is often visually preferred. Insulating below slab-on-grade foundations EcoFoil Under Slab Insulation consists of a layer of metalized foil centered between a layer of bubble insulation laminated to each side with a permanent bond. It is important to install insulation at all boundaries between conditioned floor space and exterior sections of the slab. Below-Grade Under Slab with FOAMULAR® XPS insulation. EcoFoil developed this patented product for just this reason - to serve as a superior concrete floor insulation and concrete vapor barrier, but also to serve as a radiant barrier insulation which reflects radiant heat (see "How A Radiant Barrier Works"). Most builders install 2 in. EcoFoil Under Slab Insulation is a patented breakthrough product in the concrete slab insulation industry.

We welcome the opportunity to answer any questions you may have! Both codes state, “Slab-edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation.” Otherwise, both codes require that “slab-on-grade floors with a floor surface less than 12 in. There will be some challenges insulating the edge between the house and garage, accommodating brick or stone facades, and protecting any exposed insulation.

Do you have a project that requires EcoFoil insulation for an under-concrete application?

This patented product is a modern solution for your radiant floor, basement floor, garage, driveway and metal building floor. Just like the name implies, this insulation can be used under any concrete slab to reflect 57% of radiant heat. - M.K. Spray foam for sure has uses where it is the best choice by a long shot, but under a slab is not the place.

When building a home, conditions such as climate and soil quality will likely determine which type of slab you build on. Monolithic, or thickened-edge, slabs can only be insulated on the exterior. I plan to do HE Pex in floor radiant water heat. It is specifically manufactured to withstand the pressure and corrosive nature of concrete and to provide the most reflectivity of any under slab insulation on the market.


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